Re: Twin Turbo Big Block *video*
[Re: Defbob]
#582654
01/15/10 05:04 PM
01/15/10 05:04 PM
|
Joined: Jan 2003
Posts: 8,194 Detroit, MI
CokeBottleKid
master
|
master
Joined: Jan 2003
Posts: 8,194
Detroit, MI
|
Quote:
The Turbos are too small. i should have gotten T4's, but i figured these would make boost off of idle and almost act like a supercharger
Ya, sounds good up until you hit 3k at WOT and stop making power/start detonating like crazy .
|
|
|
Re: Twin Turbo Big Block *video*
[Re: Defbob]
#582657
01/15/10 06:37 PM
01/15/10 06:37 PM
|
Joined: Jan 2003
Posts: 24,562 Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
|
Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
|
Quote:
btw, it makes 2lbs idling at 1000rpm
how? I had a paxton on a very mild 440 w/ not much stall and in N I'd get no boost no matter the rpms? My understanding is unless the engine has a load, and in N it shouldn't you should have no boost???? even at highway speeds my boost was minimal. Does a turbo(s) work different?
|
|
|
Re: Twin Turbo Big Block *video*
[Re: Mr.Yuck]
#582658
01/15/10 07:58 PM
01/15/10 07:58 PM
|
Joined: Aug 2005
Posts: 774 Southington Ct.
turbobitt
super stock
|
super stock
Joined: Aug 2005
Posts: 774
Southington Ct.
|
Tim,
Two things come to mind, First is that the turbine and/or the housing A/R is much to small. Second - the Backpressure will most likley climb very fast and create valve float and other issues before you get in any usable RPM band. If possible, I would try and plumb a gage port in at least one of the manifolds and monitor backpressure. In a perfect system, It should be near a 1:! ratio around your usable power band. It looks like in your case the Backpressure is going to be way to high and climb while your boost drops. Another thing that may happen is turbo overspeed. You may bust the compressor wheel if you spin it up to fast with that backpressure. Allan G.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
|
|
|
Re: Twin Turbo Big Block *video*
[Re: Defbob]
#582659
01/15/10 08:48 PM
01/15/10 08:48 PM
|
Joined: Nov 2007
Posts: 778 Sherwood park, Alberta.
go green
super stock
|
super stock
Joined: Nov 2007
Posts: 778
Sherwood park, Alberta.
|
Quote:
btw, it makes 2lbs idling at 1000rpm
Your blow off valve should be manifold referanced and your wastegate bottom port should manifold referanced .
You should have vacuum at idle .
There is something out of whack.
You should see the blow off valve open at idle and slam shut when you chop the throttle if you have all that boost.
The exhaust manifold length has nothing to do with it.
|
|
|
Re: Twin Turbo Big Block *video*
[Re: Defbob]
#582663
01/15/10 09:33 PM
01/15/10 09:33 PM
|
Joined: Aug 2005
Posts: 774 Southington Ct.
turbobitt
super stock
|
super stock
Joined: Aug 2005
Posts: 774
Southington Ct.
|
Tim,
What ae the specs on the turbos ? Allan G.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
|
|
|
Re: Twin Turbo Big Block *video*
[Re: turbobitt]
#582666
01/15/10 11:38 PM
01/15/10 11:38 PM
|
Joined: Nov 2004
Posts: 3,619 Norwich CT USA
Defbob
OP
master
|
OP
master
Joined: Nov 2004
Posts: 3,619
Norwich CT USA
|
Quote:
Tim,
What ae the specs on the turbos ? Allan G.
T3/T4 Turbos
T3 Flange to Manifold - 5 Bolt Hot Side Downpipe Flange - .50 A/R Compressor - .63 A/R Turbine - 3" Inlet & 2" Outlet - 1/8 NPT Oil Inlet - 350 WHP capable - 5~30 PSI Working Pressure - Computer Balanced Individually
|
|
|
Re: Twin Turbo Big Block *video*
[Re: Defbob]
#582669
01/16/10 09:45 AM
01/16/10 09:45 AM
|
Joined: Jan 2003
Posts: 24,562 Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
|
Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
|
Quote:
the mechanical fuel pump is boost referenced and surprisingly works
that's what I did too. When I was told how to do it I was like...what no way that's going to work.
|
|
|
|
|